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FIX(#2266/#2267): Temporary workaround for cfscrape issues - Anorov/cloudflare-scrape#206
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davalanche
evilhero
parent
14c933594b
commit
224c354c99
1 changed files with 71 additions and 15 deletions
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@ -2,17 +2,21 @@ import logging
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import random
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import re
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import subprocess
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from copy import deepcopy
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from time import sleep
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import copy
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import time
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from requests.sessions import Session
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from collections import OrderedDict
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try:
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from urlparse import urlparse
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from urlparse import urlunparse
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except ImportError:
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from urllib.parse import urlparse
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from urllib.parse import urlunparse
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__version__ = "1.9.5"
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__version__ = "1.9.7"
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DEFAULT_USER_AGENTS = [
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"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
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@ -24,8 +28,6 @@ DEFAULT_USER_AGENTS = [
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"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0"
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]
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DEFAULT_USER_AGENT = random.choice(DEFAULT_USER_AGENTS)
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BUG_REPORT = """\
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Cloudflare may have changed their technique, or there may be a bug in the script.
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@ -45,12 +47,13 @@ https://github.com/Anorov/cloudflare-scrape/issues\
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class CloudflareScraper(Session):
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def __init__(self, *args, **kwargs):
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self.delay = kwargs.pop("delay", 8)
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self.default_delay = 8
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self.delay = kwargs.pop("delay", self.default_delay)
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super(CloudflareScraper, self).__init__(*args, **kwargs)
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if "requests" in self.headers["User-Agent"]:
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# Set a random User-Agent if no custom User-Agent has been set
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self.headers["User-Agent"] = DEFAULT_USER_AGENT
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self.headers["User-Agent"] = random.choice(DEFAULT_USER_AGENTS)
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def is_cloudflare_challenge(self, resp):
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return (
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@ -61,6 +64,19 @@ class CloudflareScraper(Session):
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)
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def request(self, method, url, *args, **kwargs):
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self.headers = (
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OrderedDict(
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[
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('User-Agent', self.headers['User-Agent']),
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('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'),
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('Accept-Language', 'en-US,en;q=0.5'),
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('Accept-Encoding', 'gzip, deflate'),
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('Connection', 'close'),
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('Upgrade-Insecure-Requests', '1')
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]
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)
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)
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resp = super(CloudflareScraper, self).request(method, url, *args, **kwargs)
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# Check if Cloudflare anti-bot is on
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@ -70,22 +86,22 @@ class CloudflareScraper(Session):
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return resp
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def solve_cf_challenge(self, resp, **original_kwargs):
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sleep(self.delay) # Cloudflare requires a delay before solving the challenge
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start_time = time.time()
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body = resp.text
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parsed_url = urlparse(resp.url)
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domain = parsed_url.netloc
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submit_url = "%s://%s/cdn-cgi/l/chk_jschl" % (parsed_url.scheme, domain)
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cloudflare_kwargs = deepcopy(original_kwargs)
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cloudflare_kwargs = copy.deepcopy(original_kwargs)
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params = cloudflare_kwargs.setdefault("params", {})
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headers = cloudflare_kwargs.setdefault("headers", {})
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headers["Referer"] = resp.url
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try:
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params["s"] = re.search(r'name="s"\svalue="(?P<s_value>[^"]+)', body).group('s_value')
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params["jschl_vc"] = re.search(r'name="jschl_vc" value="(\w+)"', body).group(1)
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params["pass"] = re.search(r'name="pass" value="(.+?)"', body).group(1)
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except Exception as e:
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# Something is wrong with the page.
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# This may indicate Cloudflare has changed their anti-bot
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@ -96,16 +112,28 @@ class CloudflareScraper(Session):
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# Solve the Javascript challenge
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params["jschl_answer"] = self.solve_challenge(body, domain)
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# Check if the default delay has been overridden. If not, use the delay required by
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# cloudflare.
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if self.delay == self.default_delay:
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try:
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self.delay = float(re.search(r"submit\(\);\r?\n\s*},\s*([0-9]+)", body).group(1)) / float(1000)
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except:
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pass
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# Requests transforms any request into a GET after a redirect,
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# so the redirect has to be handled manually here to allow for
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# performing other types of requests even as the first request.
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method = resp.request.method
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cloudflare_kwargs["allow_redirects"] = False
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redirect = self.request(method, submit_url, **cloudflare_kwargs)
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end_time = time.time()
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# Cloudflare requires a delay before solving the challenge
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time.sleep(self.delay - (end_time - start_time))
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redirect = self.request(method, submit_url, **cloudflare_kwargs)
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redirect_location = urlparse(redirect.headers["Location"])
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if not redirect_location.netloc:
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redirect_url = "%s://%s%s" % (parsed_url.scheme, domain, redirect_location.path)
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redirect_url = urlunparse((parsed_url.scheme, domain, redirect_location.path, redirect_location.params, redirect_location.query, redirect_location.fragment))
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return self.request(method, redirect_url, **original_kwargs)
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return self.request(method, redirect.headers["Location"], **original_kwargs)
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@ -116,8 +144,15 @@ class CloudflareScraper(Session):
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except Exception:
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raise ValueError("Unable to identify Cloudflare IUAM Javascript on website. %s" % BUG_REPORT)
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js = re.sub(r"a\.value = (.+ \+ t\.length).+", r"\1", js)
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js = re.sub(r"\s{3,}[a-z](?: = |\.).+", "", js).replace("t.length", str(len(domain)))
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js = re.sub(r"a\.value = (.+\.toFixed\(10\);).+", r"\1", js)
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# Match code that accesses the DOM and remove it, but without stripping too much.
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try:
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solution_name = re.search("s,t,o,p,b,r,e,a,k,i,n,g,f,\s*(.+)\s*=", js).groups(1)
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match = re.search("(.*};)\n\s*(t\s*=(.+))\n\s*(;%s.*)" % (solution_name), js, re.M | re.I | re.DOTALL).groups()
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js = match[0] + match[-1]
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except Exception:
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raise ValueError("Error parsing Cloudflare IUAM Javascript challenge. %s" % BUG_REPORT)
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js = js.replace("t.length", str(len(domain)))
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# Strip characters that could be used to exit the string context
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# These characters are not currently used in Cloudflare's arithmetic snippet
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@ -126,9 +161,30 @@ class CloudflareScraper(Session):
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if "toFixed" not in js:
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raise ValueError("Error parsing Cloudflare IUAM Javascript challenge. %s" % BUG_REPORT)
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# 2019-03-20: Cloudflare sometimes stores part of the challenge in a div which is later
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# added using document.getElementById(x).innerHTML, so it is necessary to simulate that
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# method and value.
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try:
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# Find the id of the div in the javascript code.
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k = re.search(r"k\s+=\s+'([^']+)';", body).group(1)
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# Find the div with that id and store its content.
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val = re.search(r'<div(.*)id="%s"(.*)>(.*)</div>' % (k), body).group(3)
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except Exception:
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# If not available, either the code has been modified again, or the old
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# style challenge is used.
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k = ''
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val = ''
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# Use vm.runInNewContext to safely evaluate code
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# The sandboxed code cannot use the Node.js standard library
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js = "console.log(require('vm').runInNewContext('%s', Object.create(null), {timeout: 5000}));" % js
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# Add the atob method which is now used by Cloudflares code, but is not available in all node versions.
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simulate_document_js = 'var document= {getElementById: function(x) { return {innerHTML:"%s"};}}' % (val)
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atob_js = 'var atob = function(str) {return Buffer.from(str, "base64").toString("binary");}'
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# t is not defined, so we have to define it and set it to the domain name.
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js = '%s;%s;var t="%s";%s' % (simulate_document_js,atob_js,domain,js)
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buffer_js = "var Buffer = require('buffer').Buffer"
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# Pass Buffer into the new context, so it is available for atob.
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js = "%s;console.log(require('vm').runInNewContext('%s', {'Buffer':Buffer,'g':String.fromCharCode}, {timeout: 5000}));" % (buffer_js, js)
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try:
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result = subprocess.check_output(["node", "-e", js]).strip()
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